Selective photoelectrocatalytic oxidation of 5-(hydroxymethyl)-2-furaldehyde in water by using Pt loaded nanotube structure of TiO 2 on Ti photoanodes

Özcan, Levent; Yalçın, Pınar; Alagöz, Oğuzhan; Yurdakal, Sedat

doi:10.1016/j.cattod.2016.07.024

Cited by 42 publications

(24 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There were several efforts to photocatalytically upgrade HMF, and in most cases FDC was a principal reaction product [19][20][21], while only with the assistance of a metal-organic cocatalyst FDCA was produced [22]. If the control over the HMF to FDC oxidation selectivity is relatively easily achieved in organic solvents, where hydroxyl radicals are not produced [23], carrying out the same reaction in water is a more complicated task.…”

Section: -mentioning

confidence: 99%

Selective photocatalytic oxidation of 5-hydroxymethyl-2-furfural in aqueous suspension of polymeric carbon nitride and its adduct with H2O2 in a solar pilot plant

et al. 2018

View full text Add to dashboard Cite

This work reports a study on the reactivity of pristine and H2O2 treated carbon nitride samples for sunlight photocatalytic selective reactions. The characterization of these materials was reported in a previous paper where the reactivity versus the partial oxidation of 5hydroxymethylfurfural (HMF) was studied by using two different laboratory scale photoreactors; one irradiated by UV lamps and the other one by natural sunlight. In the present study it has been confirmed the effectiveness of these C3N4 based materials for the selective partial oxidation of HMF to FDC (2,5-furandicarboxaldehyde) in aqueous medium in a pilot plant photoreactor irradiated by natural solar light. The reactivity results and, in particular, the selectivity to FDC formation have been very encouraging, mostly by considering that the reaction was carried out in water. Moreover, they are comparable with those obtained in the laboratory scale photoreactor irradiated by both UV artificial lamps and natural sunlight. Interestingly, the pristine C3N4 sample has shown a higher HMF conversion with respect to that of the C3N4-H2O2 adduct, but the last one is more selective to the FDC formation. A kinetic study indicates that, the pseudo-2 first-order rate constant for HMF oxidation is higher in the case of bare photocatalyst and that the equilibrium adsorption constants of HMF are higher in the case of C3N4-H2O2 adduct catalyst. Finally, the partial oxidation of two aromatic alcohols, i.e. benzyl alcohol (BA) and 4-methoxy benzyl alcohol (4-MBA) to benzaldehyde (BAL) and 4-methoxy benzaldehyde (4-MBAL), respectively, has also been studied. It has been found that the inductive and delocalization effects as well as the ortho-para orienting ability of the methoxy group with respect to the hydroxyl one affects the conversion of aromatic alcohol and the selectivity towards the corresponding aldehyde.

show abstract

Section: -mentioning

confidence: 99%

Selective photocatalytic oxidation of 5-hydroxymethyl-2-furfural in aqueous suspension of polymeric carbon nitride and its adduct with H2O2 in a solar pilot plant

et al. 2018

View full text Add to dashboard Cite

show abstract

“…HMF itself was subjected to electrophotocatalytic [24] and photocatalytic conversion in aqueous phase using TiO2 as the photocatalyst, and FDC was found to be the main oxidation product of this reaction [25,26]. Although TiO2, and especially N-doped TiO2 promoted the formation of FDC from HMF, the selectivity of this process was low reaching 30% for the best photocatalysts, owing to formation on the TiO2 surface of highly oxidative hydroxyl radicals inducing the substrate mineralisation [26].…”

Section: Introductionmentioning

confidence: 99%

Selective photocatalytic oxidation of 5-hydroxymethylfurfural to 2,5-furandicarboxaldehyde by polymeric carbon nitride-hydrogen peroxide adduct

Ilkaeva

Krivtsov

García‐López

et al. 2018

Journal of Catalysis

View full text Add to dashboard Cite

Polymeric carbon nitride-hydrogen peroxide adduct (PCN-H2O2) has been prepared, thoroughly characterised and its application for selective photocatalytic conversion of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxaldehyde (FDC) in aqueous suspension has been studied. The PCN-H2O2 adduct is stable in aqueous suspension under UV and solar irradiation up to 100 °C. It is also stable up to 200 °C if heated in air, while at temperatures close to 300 °C its decomposition takes place. Based on the obtained characterisation data it has been proposed that H2O2 attaches to the non-polymerised carbon nitride species and to the heptazine nitrogen atoms, thus producing strong hydrogen bonding within the PCN-H2O2 adduct. The blockage of the surface amino-groups in PCN-H2O2 by H2O2 hinders the interaction of HMF with these sites, which are responsible for unselective substrate conversion. PCN-H2O2 possesses a superior selectivity in natural solar light assisted oxidation of HMF to FDC reaching 80% with respect to its thermally etched PCN counterpart, which gives rise to a 40-50% selectivity. We believe that the exceptional performance of the applied photocatalyst in the selective photocatalytic conversion of HMF to a high added value FDC in a green solvent under natural illumination makes a significant contribution to the development of environmentally friendly technologies for biomass valorisation.

show abstract

“…Nowadays, nanostructured TiO 2 is frequently used in PEC studies in many different areas such as degradation of harmful compounds [ 13 , 14 ], water splitting reactions [ 15 , 16 ] or partial oxidations [ 9 , 17 , 18 ] due to its high surface area and good electron transport characteristics [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

“…For the first time, we reported the selective PEC oxidation of 5-(hydroxymethyl)-2-furaldehyde to 2,5-furandicarbaldehyde by nanotube structured TiO 2 on Ti layer as photoanodes, prepared by anodic oxidation method in HF medium [ 18 ]. In addition, the photoanodes were also platinized by photoreduction method and both product selectivity and PEC activity significantly increased.…”

Section: Introductionmentioning

confidence: 99%

Photoelectrocatalytic Degradation of Paraquat by Pt Loaded TiO2 Nanotubes on Ti Anodes

2018

Self Cite

View full text Add to dashboard Cite

Nanotube structured TiO2 on Ti surface were prepared in ethylene glycol (Ti/TiO2NTEG) medium by anodic oxidation method with different times and then the plates were calcinated at different temperatures. Non-nanotube structured Ti/TiO2, prepared by thermal oxidation method, and nanotube structured TiO2 on Ti plate in hydrogen fluoride solution were also prepared for comparison. Pt loaded Ti/TiO2NTEG photoanodes were also prepared by cyclic voltammetry method with different cycles and the optimum loaded Pt amount was determined. Photoanodes were characterized by using X-ray Diffraction (XRD), Scanning Electron Microscopy-Energy-Dispersive X-ray Analysis (SEM-EDX), and photocurrent methods. XRD analyses proved that almost all TiO2 is in anatase phase. SEM analyses show that nanotubes and Pt nanoparticles on nanotube surface are dispersed quite homogeneously. The longest nanotubes were obtained in the ethylene glycol medium and the nanotube length increased by increasing applied anodic oxidation time. In addition, a linear correlation between nanotube length and XRD peak intensity was found. Moreover, SEM-EDX and XRD analyses evidence that Pt nanoparticles on nanotube surface are metallic and in cubic structure. Photoelectrocatalytic degradation of paraquat was performed using the prepared photoanodes. Moreover, electrocatalytic and photocatalytic degradations of paraquat were also investigated for comparison, however lower activities were observed. These results evidence that the photoanodes show a significant synergy for photoelectrocatalytic activity.

show abstract

Selective photoelectrocatalytic oxidation of 5-(hydroxymethyl)-2-furaldehyde in water by using Pt loaded nanotube structure of TiO 2 on Ti photoanodes

Cited by 42 publications

References 27 publications

Selective photocatalytic oxidation of 5-hydroxymethyl-2-furfural in aqueous suspension of polymeric carbon nitride and its adduct with H2O2 in a solar pilot plant

Selective photocatalytic oxidation of 5-hydroxymethyl-2-furfural in aqueous suspension of polymeric carbon nitride and its adduct with H2O2 in a solar pilot plant

Selective photocatalytic oxidation of 5-hydroxymethylfurfural to 2,5-furandicarboxaldehyde by polymeric carbon nitride-hydrogen peroxide adduct

Photoelectrocatalytic Degradation of Paraquat by Pt Loaded TiO2 Nanotubes on Ti Anodes

Contact Info

Product

Resources

About